Disturbance eliminator for radioreceivers



Ma -ch 119,, 1935. W L LQQ4Z$ DISTURBANCE ELIMINATOR FOR RADIORECEIVERSFiled April 22, 1953 2 Sheets-Sheet l I n venior WM??? W WaZZa/we m M Qg r Attorney March 19 1935. w. w. WALLACE DISTURBANCE ELIMINATOR FORRADIORECEIVERS Fild April 22, 1955 2 Sheets-Sheet '2 iwwwwwmmm TI.

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Patented Mar. 19, 1935 testis p 9 53 mammal: ELlIMINATOR Fon iRADIORECEIVERS Walter W. Wallace; Frederick, Md assignor to Sherman B.Bowers, Frederick, Md.

Application April 22, 193s, Serial ndcemsz 1 Claims (Cl. 250-20) Thisinvention appertains to new anduseful improvements in disturbanceeliminators for radio receivers. The so-cal1ed 'fstatic which forms themain disturbance in radio receivers is believed to be due to the highamperage of the transmitted. energy,-which tends to produce adisturbance in the transmitted wave and results in a distortion thereof,when both the wave and the disturbance are admitted to the receiver,tending to produce infidelity in reproduction.

Ihe principal object of this invention is to eliminate this distortedenergy by diverting the same to ground prior to its reception by thereceiver.

Another important object of the invention is to divert distorted energyor electrical disturbances accompanying transmitted waves by di-'verting the same to ground before they reach the receiver withoutdecreasing the volume of the acceptable wave.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawings:-

Figure 1 represents a diagrammatic view disclosing the connectionsbetween the electrical devices involved.

Figure 2 is a side elevational-View of the magnetic coil.

Figure 3 represents a cross sectional view through the magnetic coil.

Figure 4 representsa view in perspective showing several of the elementsof one of the condensers spaced apart and in the transposedrelation'with respect to each other as intended.

Figure 5 represents a longitudinal sectional view through thetwenty-eight plate unit.

Figure 6 represents a perspective View of one of the plates of the saidunit.

Figure '7 is a sectional View through one of the spherically woundcoils.

Referring to the drawings wherein like nu merals. designate like parts,it can be seen that there are two static dissipating units employed,which are shown in Figure 1 and designated by numerals 5 and 6. Each ofthese units is constructed of a plurality of plates 7, each beingsubstantially E-shaped and adapted to be arranged alternately in theinverted position shown in Figure 4, to secure the'desired transpositionof energy.

The outer leg portions of each of the elements '7 are wound with theconductor 8 and all of the elements are connected together in series, assubstantially shown in Figure 4. These conductor paraffin or some othersimilar material so that the elements are maintained properly spacedfrom each other'at all times.

1 Inner legs ortongues 10 of these elements 7 are not; wound as are the.outer legs and assume the alternate oppositely directed position withrespect to each other, as is apparent in Figure 5. It is preferable thatthe unit 5 be built up of more elements than the unit 6 and by way ofdistinction herein, the unit 5 has been shown made up of twenty-eightelements or fourteen transpositions, whereas the unit 6 is built up oftwentysix elements or thirteen transpositions.

The e1ectro-magnet generally referred to by numeral 11, comprises thecore 12 and the winding 13. At each side of the electro-magnet 11 is aspherically wound mass of conductive material generally referred to bynumeral 14, one end of each mass 14 being connected to one end of thewinding 13. Each of these masses acts in the nature of a load coileffecting a reactance which cuts down the amperage on the approach sideof the magnet so as to cause the loss of the undesired or high potentialenergy, while the magnet serves when excited to attract the current fromthe approach load coil 14 and to repel it through the load coil 14 onthe grounded side of themagnet.

In practice, it is preferable that these electrical devices be mountedin a casing or suitable receptacle whereon binding posts 15 and 16 arelocated. A connection may be made from the last mentioned conductor 16and a suitable ground connection may be made to the binding post 15 toground. I

The antenna lead-in is denoted by numeral 17 and connected to thebinding post 16, whereas the connection 18 is made between the bindingpost 16 and one end of the winding 8 on the unit 5.

A connection 19 is also shown at the other side of the winding of theunit 5, and the remaining end of the unit 6. A tap 20 is taken from theconnection 19 and leads to the contact 21, while a second contact 22 isconnected to the four sides of the unit 23 by a wire 26.

It will also be seen that a binding post 24 is provided and that thisbinding post 24 is connected by the conductor 25 with the last mentionedside of the unit 6. Suitable connection may be made between the usualaerial posts on the receiver and the said binding post 24.

The ground post on the receiver is connected by the wire 26 to a switcharm 27 on the conwound elements are embedded a mass9 of q tainer for thereceptacle (not shown). This switch 27 may be engaged with either thecontact 21 or the contact 22, for cutting in one or both of thecondensers 5 and 6.

It can be seen that when the blade 27 is on either the contact 16 or thecontact 21, the radio waves with static current will flow from theantenna lead-in wire 17 through either the wire 18 or wire 20 to thestatic dissipating unit. If the blade 27 is on the contact 21, only oneof the units will be cut into the system, whereas both units will be outin if the blade 27 is on the contact 16. The radio waves in havingpractically no current value, will follow the coiled conductor 8 on thelegs of the plates 7.

However, due to the amperage of the static current, this current willleave the coiled wire 8 and follow the path of least resistance bytraveling along the plate 7. This transposition of the conductorscarrying the incoming energy will serve to dissipate the undesiredinterference energy by grounding the same through the plates 7 and wire25. Thus the units 5 and 6 serve as interference eliminating means. Inthis transposition of the wave, certain undesired currents areeliminated, however, other undesired currentshaving more afiinity forthe desired currents than those eliminated in the above transpositionstep, areeliminated by reducing the amperage of the current in passingthe same through the load coils 14, which serve to collect and releasethe current by the excitation of the magnet involving the coil 13 andcore 12.

While the foregoing specification sets forth series, one side of theunit being connected to the usual antenna, a pair of load coilsinterposed between the -unit at its opposite side and ground andbeing'connected in series, and a magnet'connected in series between thesaid load coils.

WALTER W. WALLACE.

